<!DOCTYPE html>
<html>
   <head>
      <meta charset="UTF-8">
      <title>窗口之间的交互</title>
      <script src="event.js"></script>
   </head>
   <body>
     <button onclick="onClick_sendData()">向新窗口传递数据</button>
     <p/>
     <label id="label_return"></label>
   </body>
</html>
